<div style="float: left; width: 60%;">
    <div class="test-header">
        Enter a number to analyse:
        <input type="text" oninput="onNewNumber(this.value)"/>
    </div>
    <div style="height: 400px; padding: 10px; box-sizing: border-box;" id="myGridLeft" class="ag-theme-quartz"></div>
</div>
<div style="float: left; width: 40%;">
    <div class="test-header">
        Edit data on RHS, table updates on LHS
    </div>
    <div style="height: 400px; padding: 10px; box-sizing: border-box;" id="myGridRight" class="ag-theme-quartz"></div>
</div>